Cell Transport

• What is Diffusion?

  The net movement from of particles from an area of higher concentration to an area of a lower concentration
• What are the three main factors that affect the rate of diffusion?

  . Concentration Gradient

  . Temperature

  . Surface Area
• What four factors increase the effectiveness of a gas exchange surface?

  . Large Surface Area

  . Thin Membrane (short diffusion path)

  . Efficient Blood Supply (animals)

  . Ventilation (animals)
• What is Osmosis?

  The movement of water from a dilute solution to a concentrated solution through a partially permeable membrane
• What is Active Transport?

  The movement of molecules from a dilute solution to a concentrated solution against the concentrated gradient, using energy from respiration
• How is Active Transport used to absorb the products of digestion?

  Transports Glucose from the a lower concentration in the gut to a higher concentration in the blood. Glucose then transported to the tissues where it can be used in respiration